"There is such a thing as being big boned, but it's not a medical term," spokesperson for the American Academy of Orthopaedic Surgeons Claudette Lajam, M.D., tells The Huffington Post. "People have different sized frames ... they're responsible for you being a bigger person overall, but in general they're not responsible for you being overweight.”

While a larger frame may account for a couple of pounds, she says, it's definitely not getting you off the hook for an extra 30. "Most people's weight is carried in their soft tissue -- muscle, fatty tissue, their organs," says Lajam, "so blaming extra weight on your bones is not accurate." And she should know: While performing knee and hip replacements on overweight patients, she sees those bones firsthand. "One of my mentors would say: 'I have seen your bones, and they're not big..."

Only about 15 percent of people do have a larger than average frame, and about the same have a smaller than average skeleton. The majority of us, therefore, are just average. There is, however, a pretty easy way to find out, which compares the circumference of your wrist to your height.